cover SHANGHAI: 1898 (6 Jan.) opened out envelope, registered to Constantinople bearing on the reverse Dowager small figures 4c. on 4ca. (2), large figures ½c. on 3ca. (2), 1c. on 1ca. and 10c. on 9ca. cancelled by Shangahi Dollar chops with appropriate transit c.d.s., the front with pair of Hong Kong 10c. purple on red tied by Shanghai c.d.s. with two different registration marks; a good franking to a scarce destination